I've had decent luck with a few other brands, but also had a few cheaper ones that puffed up. None of my Phantom 2200 mah batteries have ever gotten puffy and they all have performed very well. After the others have gone bad I plan to replace them with original DJI Phantom batteries.

I'm thinking about buying a couple of replacement batteries for my FC40, and was wondering if I should stick with the DJI Phantom batteries or buy others.

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Depends on how long you plan to fly and what you intend to do. (Video)? I've used the original 2200's for just goofing off or to check on some modifications I've made. Other times, I've used Black Magic's 2700mAh for longer fights and videos. And have gotten desirable times with it. As for the 4000mAh's as mentioned, they'll give you much more flight time but again as mentioned. You'll need to modify the battery compartment to get it to fit properly. There are youtube videos showing how to modify your Phantom to get the 4000mAh battery to fit.

Hobbyking.com 4000mah are the best for the price by far. Don't use them if u have a quad that is overweight tho. If already too heavy, go with a mad dog 2700 or something along those lines. Don't bother with the no name brands as you usually get what you pay for in this feild

I might grab 2 of them to try out the dual battery setup. I've heard bad things about dual battery setups cause they r too much weight. Any input?

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If you are an adventurous flyer, flying will be much more of an adventure. If you are going up and hovering while taking a few pics its not too bad. Handles more weird in wind as if the FC 40 wasn't sensitive enough in wind. You only gain a 2 or 3 minutes more because you have to take the weight into consideration. Thats my experience with the dual setup.

I bought 4 4000 multistar batteries and modded the front door with a dremel so they fit. In my opinion that is the best option I am getting a little under 17 minutes for each flight. I am not a madman with my flying, I'm just just shooting video and taking pics at scenic locations but for me this is great